Abstract

We develop a real-space theoretical framework for graphene nanostructures composed of triangulenes and armchair graphene nanoribbons (AGNRs) to explain the microscopic origin of interface states and compact localized states in triangulene-based Y-junctions. By tuning inter-segment coupling in a tight-binding model, the work shows how triangulene zero-energy modes and AGNR end states evolve into node orbitals at junctions, derives a universal relation for their number and chirality, reproduces tunneling spectra for experimentally synthesized triangulene nanographenes within an extended Anderson model, and demonstrates a design route to artificial graphene nanoribbons with tunable flat subbands and anisotropic quantum transport.

Abstract

We develop a real-space theoretical framework for graphene nanostructures composed of triangulenes and armchair graphene nanoribbons (AGNRs) to explain the microscopic origin of interface states and compact localized states in triangulene-based Y-junctions. By tuning inter-segment coupling in a tight-binding model, the work shows how triangulene zero-energy modes and AGNR end states evolve into node orbitals at junctions, derives a universal relation for their number and chirality, reproduces tunneling spectra for experimentally synthesized triangulene nanographenes within an extended Anderson model, and demonstrates a design route to artificial graphene nanoribbons with tunable flat subbands and anisotropic quantum transport.

Abstract

We develop a real-space theoretical framework for graphene nanostructures composed of triangulenes and armchair graphene nanoribbons (AGNRs) to explain the microscopic origin of interface states and compact localized states in triangulene-based Y-junctions. By tuning inter-segment coupling in a tight-binding model, the work shows how triangulene zero-energy modes and AGNR end states evolve into node orbitals at junctions, derives a universal relation for their number and chirality, reproduces tunneling spectra for experimentally synthesized triangulene nanographenes within an extended Anderson model, and demonstrates a design route to artificial graphene nanoribbons with tunable flat subbands and anisotropic quantum transport.

Abstract

We develop a real-space theoretical framework for graphene nanostructures composed of triangulenes and armchair graphene nanoribbons (AGNRs) to explain the microscopic origin of interface states and compact localized states in triangulene-based Y-junctions. By tuning inter-segment coupling in a tight-binding model, the work shows how triangulene zero-energy modes and AGNR end states evolve into node orbitals at junctions, derives a universal relation for their number and chirality, reproduces tunneling spectra for experimentally synthesized triangulene nanographenes within an extended Anderson model, and demonstrates a design route to artificial graphene nanoribbons with tunable flat subbands and anisotropic quantum transport.